Tooth at Resteigne (Be)

[2Ronalds]

I found what I think must be a tooth. In the Devonian, no reptiles were around, so if it is a tooth, it is probably shark or some large fish. It was very distictly black against the grey matrix. Regrettably the tip was broken when I found it, the inside dull, but black. It is 20x11mm across and 22mm high. The edge seems a bit sharper, but it is not serrated. There is some paralel striping appr. 1 mm apart lengthwise.

Does anyone recognise this fossil?

[sjaak]

I do not think this is a tooth, but the internal mold of bivalve.

[Frederik]

Since specific 'tooth' textures or structures are missing, and considering the location, tooth can virtually be ruled out as an option. Instead, I believe it is obviously an internal mould of a mollusc.
However, I would not opt for bivalve too fast
Have you considered the option that it could be cephalopod? More specifically the body chamber.

[2Ronalds]

Thanks Niels and Frederik,

I am considering it may be the interal mould of a mollusc. However, if it is an internal mould, the shell should be on the negative, which it is not, or the shell has desolved, in which case there should be a hollow space where it used to be, which is not there, or the internal mould was refossilised. Do you think this is likely at that location?

Am I right? Thanks for helping me think about it, and I hope you will reply again.

[HarryPristis]

This object reminds me of a pen (Penna sp.) shell which is fairly common in the Late Eocene of Florida.

[Frederik]

Hmmm... I might see traces of calcite (shell?) bottom pic, left edge of the matrix.

Anyway, though I see the resemblance with Pinna fossils this one is most definitely no Pinne given the age.

My bet would still be on cephalopod.

[Bram]

Maybe it's an internal mould of an inarticulate brachiopod, like Lingula? The very faint ribs make me think this.